I say probably not. I read an article by David Reher in National Dragster once that addressed this very question and his answer was no, whatever increased resistance there is to opening the valve is negated by that same force in closing the valve.
wouldn't that be more of a harmonics thing? i mean i get what your saying, the valve/spring would help turn the engine over on the way up, but you would still have that initial resistance, maybe more harmonics than anything??